Hideo Kojima's other PlayStation 2 franchise, Zone of the Enders, last saw an entry back in March of 2003. While the first was a commercial success, mostly due to the included Metal Gear Solid 2 demo, it was largely panned by critics. ZOE2: The Second Runner was its evil twin, a limited release that became a coveted, well reviewed title, bordering on collector's item. (That reminds me, ZOE2 is now available for purchase at Game Quest Direct, if you're looking for it.)
Now there's talk of a third being readied for Sony's PlayStation 3, much to the delight of Jehuty fans.